We can hear sound of frequency_______.
Complete the following sentences :
(a) An average person can hear sound of frequencies in the range ___ to ___.
(b) Ultrasound is of frequency ___ .
(c) Infrasonic sound is of frequency ___ .
(d) Bats can produce and hear ___ sound.
(e) Elephants produce ___ sound.
A man can hear the sound of frequency :
(a) 1 Hz
(b) 1000 Hz
(c) 200 kHz
(d) 5 MHz
(a) What is the upper limit of frequency of human hearing ?
(b) What is the lower limit of frequency of human hearing ?
(c) Name one animal which can produce ultrasonic sounds.
(d) Name two animals which can hear ultrasonic sounds.